...Althoughgonadal response and seasonal restriction of breeding are set bythe photoperiod, specific temporal relationships are dictated by moreimmediate environmental variables... 
Richard F. Johnston 「The Breeding Birds of Kansas」
...This conclusion is warranted if we examine what would happen tofrequency distributions if the variables or oscillators regulatingtiming were linked...
Richard F. Johnston 「The Breeding Birds of Kansas」
...There are many variables of the Algol type, and information issteadily accumulating...
George Forbes 「History of Astronomy」
...The number of known variables of the Algol type is, so far, small; notmuch indeed over thirty...
Cecil G. Dolmage 「Astronomy of To-day」
...Thisexplanation it might have been difficult to receive, when the periods ofthe known variables were so markedly various in length...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...Algol is one type of these regular variables,having a period of 68...
George C. Comstock 「A Text-Book of Astronomy」
...—In addition to thesethere is a certain further number of binary variables inwhich both components are bright and where the variationof brightness follows a very different course...
George C. Comstock 「A Text-Book of Astronomy」
...An equation with four variables usually requires space of fourdimensions for its geometrical interpretation, and so on...
Oliver Lodge 「Pioneers of Science」
...Bailey's observations show that variablestars sometimes exist in large numbers in clusters, althoughthe variables thus observed are of short period...
Garrett Serviss 「Pleasures of the telescope」
...The two neighboring variables just referred to areinteresting...
Garrett Serviss 「Pleasures of the telescope」
...The variables T and R are oflittle interest to us, for they never become bright enoughto be seen without the aid of a telescope...
Garrett Serviss 「Pleasures of the telescope」
...Roberts, in South Africa, has done splendid work on the periods of variables ofthe Algol type...
George Forbes 「History of Astronomy」
...Are all other stars constant in brightness? The example ofMira Ceti and of other known variables makes this at least doubtful...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...It must, therefore, be exceedinglyerratic in its changes, resembling rather the temporarystars than the true variables...
Garrett Serviss 「Pleasures of the telescope」
...The variables S and R are both red...
Garrett Serviss 「Pleasures of the telescope」
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